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The sale will see the end of production of mobile phones by Nokia.

Microsoft has completed its purchase of Nokia's mobile phone business for 5.44bn euros ($7.5bn; £4.5bn).

The deal between the two firms should have been completed earlier this year but it was delayed by a hold-up in regulatory approvals.

The sale will see the end of production of mobile phones by Nokia.

"Today we welcome the Nokia devices and services business to our family," said Microsoft chief executive Satya Nadella.

"The mobile capabilities and assets they bring will advance our transformation."

The Finnish company will now focus on networks, mapping services and technology development and licences.

Two Nokia plants will remain outside the deal - a manufacturing unit in Chennai, India, subject to an asset freeze by Indian tax authorities, and the Masan plant in South Korea, which it plans to shut down.